# -*- coding: utf-8 -*-
"""
# @Time    : 2021/1/7 下午3:12
# @Author  : tgy
"""
import os

def test01():
    ...
    ages = [1, 2, 3, 4]
    ages2 = (val*val for val in ages if val > 2)
    print(ages2)
    # 笛卡尔集
    jo = [n + m for n in "abc" for m in 'ABC']
    print(jo)


def test02():
    print([d for d in os.listdir('.')])


if __name__ == '__main__':
    ...
    test02()
